Steps:

• Slice the steak against the grain into very thin slices.
• Combine the soy sauce, sherry, and cornstarch and pour this mixture over the steak.
• Marinate the meat for 15 minutes.
• While the meat is marinating, slice the broccoli at a diagonal and mince garlic and ginger.
• Heat a wok or large frying pan for 30 seconds, add oil, wait about 20 seconds, and add minced garlic and ginger root. Fry over high heat, stirring constantly for about 20 seconds more, then add the beef.
• Stir-fry, stirring constantly, for about 1 minute. Add broccoli and stir-fry for another 4 to 6 minutes, until the broccoli is cooked but still crisp and still dark green.
• Serve hot. This is low in carbohydrates.

Steps:

• Whisk together the oyster sauce, sesame oil, sherry, soy sauce, sugar, and cornstarch in a bowl, and stir until the sugar has dissolved. Place the steak pieces into a shallow bowl, pour the oyster sauce mixture over the meat, stir to coat well, and marinate for at least 30 minutes in refrigerator.
• Heat vegetable oil in a wok or large skillet over medium-high heat, and stir in the ginger and garlic. Let them sizzle in the hot oil for about 1 minute to flavor the oil, then remove and discard. Stir in the broccoli, and toss and stir in the hot oil until bright green and almost tender, 5 to 7 minutes. Remove the broccoli from the wok, and set aside.
• Pour a little more oil into the wok, if needed, and stir and toss the beef with the marinade until the sauce forms a glaze on the beef, and the meat is no longer pink, about 5 minutes. Return the cooked broccoli to the wok, and stir until the meat and broccoli are heated through, about 3 minutes.